package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setMealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;


    /**
     * 新增菜品
     * @param dishDTO
     */
    @Transactional//保证原子性，涉及多个标的操作时，此处是菜品表和口味表（注意：在启动类上要开启注解方式的事物管理）
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);//将DTO相关属性拷贝都dish中，因为目前dish是空的（属性命名一致）
        //向菜品表插入一条数据，因为一次只能添加一个菜品
        dishMapper.insert(dish);//不传DTO，因为DTO中包含口味数据

        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        //从DTO中拿出口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors!=null && flavors.size()>0){//判断口味数据是否存在
            flavors.forEach(dishFlavor -> {//把dishflavor遍历出来吧dishid放进去
                dishFlavor.setDishId(dishId);
            });
            //向口味表插入n条数据，因为口味能设置多个或者不设置
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());

        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);//分页返回的结果是Page对象DishVoO类型

        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够删除--是否存在起售中的菜品
        for (Long id : ids) {//遍历数组取出具体每个id，根据id查询菜品
          Dish dish =  dishMapper.getById(id);//先获取到菜品信息
          if(dish.getStatus() == StatusConstant.ENABLE){//如果某个菜品状态是起售中，则抛一个异常不允许删除
              //起售中不能删除
              throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
          }
        }
        //判断当前菜品是否被某个套餐关联
        List<Long> setmealIds = setMealDishMapper.getSetMealIdsByDishIds(ids);//根据菜品id查询到的套餐id（获取套餐信息）
        if(setmealIds != null && setmealIds.size() > 0){//根据菜品id查询到的套餐id不是空则表示不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
        }

        //删除菜品表中的菜品数据（根据主键删除）
        for (Long id : ids) {
            dishMapper.deleteById(id);

            //删除菜品关联的口味数据（根据菜品id来删）
            dishFlavorMapper.deleteByDishId(id);
        }


    }



    /**
     * 根据id查询菜品信息
     * @param id
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //查询菜品表
        Dish dish = dishMapper.getById(id);

        //根据菜品id查询相关口味
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        //将查询到的数据封装到 VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 根据id修改菜品基本信息和对应口味信息
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //先修改菜品表基本信息
        dishMapper.update(dish);

        //删除原有的口味数据（否则情况太多，直接删掉，再添加新的口味）
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //然后重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());//dishid通过DTO来获取
            });
            //向口味表插入n条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }




    /**
     * 菜品起售停售
     *
     * @param status
     * @param id
     */
    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        if (status == StatusConstant.DISABLE) {
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            // select setmeal_id from setmeal_dish where dish_id in (?,?,?)
            List<Long> setmealIds = setMealDishMapper.getSetMealIdsByDishIds(dishIds);
            if (setmealIds != null && setmealIds.size() > 0) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
